139191 has 16 divisors (see below), whose sum is σ = 206976. Its totient is φ = 82656.

The previous prime is 139187. The next prime is 139199. The reversal of 139191 is 191931.

139191 = T₅₈ + T₅₉ + ... + T₁₀₀.

It is not a de Polignac number, because 139191 - 2² = 139187 is a prime.

139191 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139191.

It is not an unprimeable number, because it can be changed into a prime (139199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1636 + ... + 1718.

It is an arithmetic number, because the mean of its divisors is an integer number (12936).

2¹³⁹¹⁹¹ is an apocalyptic number.

139191 is a deficient number, since it is larger than the sum of its proper divisors (67785).

139191 is a wasteful number, since it uses less digits than its factorization.

139191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142.

The product of its digits is 243, while the sum is 24.

The square root of 139191 is about 373.0831006626. The cubic root of 139191 is about 51.8247304184.

The spelling of 139191 in words is "one hundred thirty-nine thousand, one hundred ninety-one".